Those that came with in bonus to assembly rack,
When the weight is applied caster of turning becomes very bad.
This item uses a bearing for swivel part, is very smooth.
Although the wheels is deformed in the long run it's made of rubber.
Urethane winding is comfortable to use without any deformation and vibration.

Part of the caster chair that you are using in the store is damaged, exchange did repair it yourself. Quality is "good".
Also it asked the wrench at the time of exchange, but was purchased from other companies not match the thickness 4 mm thickness of ultra-thin spanner in my misunderstanding.
When the caster is required at your add, by all means I would like to request here.